Key player Rebecca Baker got through a tonne of work but could also get isolated, as showing the skill to beat two players is commendable while trying for three is pushing luck.
Libbey Abbott got away some good passes while Charlotte Spence swung right to the post for a good Baker pass but just couldn't latch on.
Baker's strike after the fourth penalty corner was heart-stoppingly close with the Wellington keeper out of position, while Margie Hazelhurst also had her moments.
But Wellington stopped everything, even after losing a player to a yellow card, and managed to get back on attack in the dying minutes to keep Wanganui out of striking distance.
Manville said next year would be another rebuilding phase with six of the players, including the entire midfield, moving up to under-15s.